on www.onlineshowoff.com there is a guy with a cooper S and he says that he turbocharged it with the super still in is that possible? he says that its pushing 260 with that set-up.
turbo?
- Thread starter halfnhalf325
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TO THE 7
manuel said:
you can have a pipe with two entries and one exit...or a "Y" pipe ![[:D]](/images/smilies/biggrin.png "Big Grin [:D]")
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It is possible to have a two stage setup or have the gases flow through both.
Two stage setup: Supercharger off the line, turbo kicks in once its spooled. This setup is used to reduce turbo lag. They used to use these when engine tuning was limited to adjustment screws, but with computers these days and better bearings in turbos and general turbo design, you don't really get much benefit from this.
The other possibility is he may have the supercharger feeding the turbo. This I would not recommend to anyone running less than 130+ octane. This is usually only seen in extremely high horsepower vehicles, like those silly tractors pulls. You can get some serious pressures out of this setup way way more than a Mini engine could handle.
My typhoon has a small turbo on it, feeding a 4.3l block at an 8:1 compression; factory boost pressure is about 15psi. I know people with aftermarket turbos running about 25-28 psi but that is really at the high end of street driven. A mini engine probably couldn't handle more than 10psi in stock form maybe 15 in all out race form.
I wouldn't believe it on a mini, and I didn't even address the space consideration. He would be better off with just a turbo, tuned right, lots of intercooling, some waterspray, drive it only when the outside temp is 0deg Celsius.. etc. I would guess the supercharger is probably hooked up to his a/c system to keep all the hot air out of the car when he drives it!
Two stage setup: Supercharger off the line, turbo kicks in once its spooled. This setup is used to reduce turbo lag. They used to use these when engine tuning was limited to adjustment screws, but with computers these days and better bearings in turbos and general turbo design, you don't really get much benefit from this.
The other possibility is he may have the supercharger feeding the turbo. This I would not recommend to anyone running less than 130+ octane. This is usually only seen in extremely high horsepower vehicles, like those silly tractors pulls. You can get some serious pressures out of this setup way way more than a Mini engine could handle.
My typhoon has a small turbo on it, feeding a 4.3l block at an 8:1 compression; factory boost pressure is about 15psi. I know people with aftermarket turbos running about 25-28 psi but that is really at the high end of street driven. A mini engine probably couldn't handle more than 10psi in stock form maybe 15 in all out race form.
I wouldn't believe it on a mini, and I didn't even address the space consideration. He would be better off with just a turbo, tuned right, lots of intercooling, some waterspray, drive it only when the outside temp is 0deg Celsius.. etc. I would guess the supercharger is probably hooked up to his a/c system to keep all the hot air out of the car when he drives it!
It would work fine provided that there's enough room to install both. The turbo and supercharger would be plumbed in with a Y pipe coming off a single air filter. The air filter would run to the pipes to the turbo and supercharger, there would be then another reversed y pipe at the throttle body for both to enter. It wouldn't overboost EBJ3 because there's a wastegate on the turbo, not a "blow off valve" as someone else mentioned. The BOV serves another purpose that I'd be glad to explain.
Lancia did this with their Delta S4 Rally car in the 80's
http://www.stormloader.com/groupb/lancia.html
More difficult than the plumbing would be the fueling demands which are non linear and very complicated.
I can't see the advantage to this setup with modern turbos spooling as fast as they do. A nice ball bearing turbo and open exhaust and you're all set. With both chargers working full time the heat gereration under the hood would be intense.
Lancia did this with their Delta S4 Rally car in the 80's
http://www.stormloader.com/groupb/lancia.html
More difficult than the plumbing would be the fueling demands which are non linear and very complicated.
I can't see the advantage to this setup with modern turbos spooling as fast as they do. A nice ball bearing turbo and open exhaust and you're all set. With both chargers working full time the heat gereration under the hood would be intense.